Wrench.



. G. W. JOHNSON, DEGD. E. e. JOHNSON, ADMINISTBATRIX.

WRENCH.

APPLIUATION FILED JUNB13,1908.

904,485. Patented Nov.17,'19o8.

529i h1 Loses @UNITED sTATEs PATENT ELNORA G. JOHNSON, OF ERIE, PENNSYLVANIA, ADMINISTRATRIX OF GEORGE W. JOHNSON, DEOEASED, ASSIGNOR TO BENJAMIN E. REED, OF RAVENNA, OHIO.

WRENCH.

Patented Nov. 1'7, 1908.

Application filed June 13, 1908. Serial No. 438,443.

To all whom 'it may concern:

Be it known that GEORGE W. JOHNSON, late a citizen of the United States, deceased, (Elnora G. Johnson, residing at Erie, County of Erie and State of Pennsylvania, Administratrix) did invent a new and useful Improvement in Pipe-Wrenches, of which the following is a specification.

This invention relates to improvements in pipe wrenches.

One object of the invention is to provide a pipe wrench with a shank having a suitable scale thereon so that the wrench may be readily adjusted to fit any size pipe without loss of time by trial.

Another object of the invention is to improve the general mechanical structure of pipe wrenches.

The invention consists of a pipe wrench having` improved mechanism and bearing a scale upon the shank thereof to enable the same to be readily set for various sizes of pipes.

The invention further consists in certain novel details of arrangement and combinations of parts, hereinafter fully described, illustrated in the accompanying drawings, and specifically set forth in the claims.

In the accompanying drawings, like characters of reference indicate like parts in the several views, and;

Figure 1 is a view partly in side elevation and partly in section of the wrench, one of the positions of the movable jaw being indicated by dotted lines. Fig. 2 is a detail view in perspective of a modification of the frame for the movable jaw.

In Fig. 1 the numeral 10 indicates the handle of the device. Upon one side of the handle are formed teeth 11, preferably of somewhat similar shape to the well known Vhitworth screw thread in cross section. Upon one end of the handle is formed the fixed jaw 12, which may be either integral with the handle or may be rigidly attached thereto. The jaw 12 is provided with the usual pipe wrench teeth 13. A frame 14C is slidably mounted on the handle 10 and has an angular opening 14: dinally therethrough and in which the handle l0 is designed to move. A slot 15 is formed in one face of the frame 14 and opens into the opening or passage 14', said slot constituting a guide-way for a locking block 16, having teeth designed to engage extending longituthe teeth 11 on the handle. A cam 17 is mounted to rotate within the outer portion of the slot and has a handle or thumb-piece 1S whereby it can be readily actuated so as to shift the locking block into engagement with the teeth of the handle. A cam spring 19 is secured to one end of the frame 14k while the free end of said spring bears normally against the cam 17'. This cam is so shaped that the spring will operate to hold the cam in the position assumed by it subsequent to shifting block 16 into engaging position. The spring also serves to hold the cam firmly in any other position to which it may be moved. u

Pivoted at 2O is a swinging jaw 21. This jaw extends upwardly from the frame 14: and is outwardly curved along the length thereof. The jaw further has a portion at an angle to the curved portion as indicated at 22 and there is provided on this angled portion pipe engaging teeth 23. The pivot end of the swinging jaw is cam shaped as indicated at 24. A spring 25 is mounted on the frame in such manner as to coact with the cam shaped end of the swinging jaw and hold the same either open or closed. This spring is preferably termed the jaw spring.

Upon one of the lateral faces of the handle is provided a scale 26 and the frame 14 has an upper edge 27 arranged to lie transverse of the handle 10 and form an indicator for the scale. The scale 26 is so arranged that the various markings thereon indicate pipe sizes and are in such position that, when the upper edge of the frame 14 is in alinement with one of said markings the jaws of the wrench will be in proper spaced relation to embrace and engage a pipe of the size corresponding to the marking on the scale.

In the modified construction, shown in Fig. 2, the frame 14 is made up of a number of pieces, all of which are preferably dropforgings. These pieces are securely held together by suitable rivets as indicated at 2S and may be of such sizes and proportions as are best fitted for the size and purpose of the wrench.

The device thus described forms a simple and efficient pipe wrench, and one which may be readily set to the desired size 0f pipe without the usual method of trial.

It is obvious that minor changes may be made in the form and proportions of the device without departing from the principlesv 1. A pipe wrench comprising` a .toothed handle, a fixed jaw at one end thereof, a frame slidably mounted on the handle and having a passage extending longitudinally therethrough for the reception of the handle, there being a slot in one face of the frame and opening into the passage, a toothed locking block slidably mounted within said slot, a cam mounted to partly rotate within the slot to shift the block into engagement with the toothed handle, elastic means lfor holding the cam in position when the block has been shifted thereby, the frame being provided with a socket at one end, a movable jaw pivotally mounted within the socket and having a cam end, and a spring seated within the socket and bearing against said end to hold the movable jaw "in either one of two positions.

2. A pipe wrench comprising a handle having teeth along one face thereof, a rigid jaw at one end of the handle, a frame slidably mounted `upon the Ihandle, there'being a slot in one face of the frameV and opening thereinto, a locking block slidably mounted within the slot and having teeth for engaging the teeth on the handle, a cam movably mounted within the slot for shifting the `block into engagement with thehandle, elastic means for holding the cam in shifted position, a movable j aw pivotally connected to the frame, elastic means within the frame and cooperating with the ljaw .to'hold said jaw in either of two positions, said handle being provided with graduations, oneend of the frame constituting an index ooperating with the graduations to indicate pipe sizes.

In testimony whereof ljhave hereunto set my hand at Erie, in the vcounty of Erie, and State of Pennsylvania, this Sth day of J une 1908.

ELNORA G. JOHNSGN,

itnesses A. A. FREEMAN, P. V. GIFFORD. 

